Will new Madeleine McCann documentary reveal a breakthrough in the case?

A new documentary which looks at the disappearance of Madeleine McCann arrives on Netflix tomorrow, Friday March 15.

The show promises a look into the circumstances surrounding the disappearance, and hints at a breakthrough.

Madeleine's parents, Kate and Gerry, refused to take part in the documentary, the Mirror reports .

Little Maddie went missing from her family's holiday villa in the Portuguese resort of Praia da Luz on May 3 2007. She was just three years old at the time.

In the nearly 12 years since, millions of pounds has been spent by British police trying to track her down - and establish whether she's still alive.

Her parents have been subjected to baseless speculation and intense scrutiny over their decision to leave Maddie and her younger twin siblings in their bedroom while the adults went out with seven of their friends to a nearby tapas restaurant.

Now, the new Netflix documentary promises to delve into the background of the disappearance and shed light on all the theories behind the little girl's disappearance.

The film-makers' synopsis reads: "A couple's grief over their daughter's disappearance is compounded by a frenzied media and a detective's mistaken belief that they played a part."

(Image: PA)

Kate and Gerry declined to participate, saying in a statement that the documentary wouldn't aid the search for their daughter.

"We are aware that Netflix are planning to screen a documentary in March 2019 about Madeleine's disappearance," they said.

"The production company told us that they were making the documentary and asked us to participate.

"We did not see - and still do not see - how this programme will help the search for Madeleine and, particularly given there is an active police investigation, it could potentially hinder it."

The parents added: "Consequently, our views and preferences are not reflected in the programme. We will not be making any further statements or giving interviews regarding this programme."

In the trailer for the documentary, a number of experts, police officials and people related to the investigation give snippets of quotes to the camera.

The trailer opens with a young child walking down a sandy beach by itself, before panning to a man who says: "The entire McCann case has become a phenomenon."

The toddler disappeared in 2007 (Image: PA)

Says another: "If you made a dozen movies out of this, no-one would believe them."

A cop then tells the camera: "I've done thousands of cases, but the Madeleine case, I've seen the worst things a human can see. The worst."

As the footage moves to a beach scene, a young girl can be seen skipping through the parasols as a unidentified man follows behind.

"If your child isn't safe at a resort, where is she safe?" says another man.

The trailer then moves into some of the theories posed by Portuguese police - including that whoever took Maddie out of the apartment was known to her.

"Some of the individuals represented a significant person of interest," another source is heard in the background.

Kate and Gerry McCann (Image: Getty Images)

"The police had suspicions that there was some collusion happening during the night that Maddie went missing," says yet another.

A third tells the camera: "This could be the breakthrough - here it is, it all fits."

And another says: "Statistically, it's likely to be someone who is in close proximity with the child."

Footage of one of Kate and Gerry's early press conferences is then shown, with Gerry telling the media: "There is no way Kate and I are involved in this abduction."

The trailer also gives detail into one of the strongest theories - that Maddie was abducted by a predator, who either killed her or sold her into a sex trafficking ring.

"One startling element is the sheer number of sexual predators in the area at the time," one man involved in the investigation says.

"It's very easy to move children to other countries," says a woman.

"Human trafficking is a massive problem," says another man.

The cop returns to tell the camera: "The value that Madeleine had was really high. There's always something left to do. 'Till you find her."

The trailer ends with footage of little Maddie, as an American man says: "Somebody knows what's happened to Madeleine McCann."

*The Disappearance Of Madeleine McCann drops on Netflix on Friday March 15